“… 16 Therefore, various doping methods have been deeply studied, such as (Co, Ga)–ZnO, 17,18 (Co, Fe)–ZnS, 19 Co–ZnSe, 20,21 (Cr, Ni, Co. Ti)–ZnSe, 22 Ga 2 O 3 –In 2 O 3 , 23 Co–Ga alloys, 24 and (Co, Ni)–ZnS. 25 In terms of the form of materials, four patterns have been focused on in research: ceramic, 26,27 thin film, 28,29 nanoparticle 30 and quantum dot. 31 The structures, and ferromagnetic and optical properties of doped materials have been mainly investigated.…”